United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "June 2004," The Employment Situation (July 2, 2004) : 14-14. https://fraser.stlouisfed.org/title/144/item/494767/toc/509146 , accessed on May 1, 2024.